304 lines
10 KiB
C#
304 lines
10 KiB
C#
/*
|
|
Copyright (C) 2011-2012 de4dot@gmail.com
|
|
|
|
This file is part of de4dot.
|
|
|
|
de4dot is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
de4dot is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using System.Collections.Generic;
|
|
using System.Text.RegularExpressions;
|
|
using Mono.Cecil;
|
|
using de4dot.blocks;
|
|
using de4dot.blocks.cflow;
|
|
|
|
namespace de4dot.code.deobfuscators.Babel_NET {
|
|
public class DeobfuscatorInfo : DeobfuscatorInfoBase {
|
|
public const string THE_NAME = "Babel .NET";
|
|
public const string THE_TYPE = "bl";
|
|
BoolOption inlineMethods;
|
|
BoolOption removeInlinedMethods;
|
|
BoolOption decryptMethods;
|
|
BoolOption decryptResources;
|
|
BoolOption decryptConstants;
|
|
BoolOption dumpEmbeddedAssemblies;
|
|
|
|
public DeobfuscatorInfo()
|
|
: base() {
|
|
inlineMethods = new BoolOption(null, makeArgName("inline"), "Inline short methods", true);
|
|
removeInlinedMethods = new BoolOption(null, makeArgName("remove-inlined"), "Remove inlined methods", true);
|
|
decryptMethods = new BoolOption(null, makeArgName("methods"), "Decrypt methods", true);
|
|
decryptResources = new BoolOption(null, makeArgName("rsrc"), "Decrypt resources", true);
|
|
decryptConstants = new BoolOption(null, makeArgName("consts"), "Decrypt constants and arrays", true);
|
|
dumpEmbeddedAssemblies = new BoolOption(null, makeArgName("embedded"), "Dump embedded assemblies", true);
|
|
}
|
|
|
|
public override string Name {
|
|
get { return THE_NAME; }
|
|
}
|
|
|
|
public override string Type {
|
|
get { return THE_TYPE; }
|
|
}
|
|
|
|
public override IDeobfuscator createDeobfuscator() {
|
|
return new Deobfuscator(new Deobfuscator.Options {
|
|
ValidNameRegex = validNameRegex.get(),
|
|
InlineMethods = inlineMethods.get(),
|
|
RemoveInlinedMethods = removeInlinedMethods.get(),
|
|
DecryptMethods = decryptMethods.get(),
|
|
DecryptResources = decryptResources.get(),
|
|
DecryptConstants = decryptConstants.get(),
|
|
DumpEmbeddedAssemblies = dumpEmbeddedAssemblies.get(),
|
|
});
|
|
}
|
|
|
|
protected override IEnumerable<Option> getOptionsInternal() {
|
|
return new List<Option>() {
|
|
inlineMethods,
|
|
removeInlinedMethods,
|
|
decryptMethods,
|
|
decryptResources,
|
|
decryptConstants,
|
|
dumpEmbeddedAssemblies,
|
|
};
|
|
}
|
|
}
|
|
|
|
class Deobfuscator : DeobfuscatorBase {
|
|
Options options;
|
|
bool foundBabelAttribute = false;
|
|
string obfuscatorName = DeobfuscatorInfo.THE_NAME;
|
|
bool startedDeobfuscating = false;
|
|
|
|
ResourceResolver resourceResolver;
|
|
AssemblyResolver assemblyResolver;
|
|
StringDecrypter stringDecrypter;
|
|
ConstantsDecrypter constantsDecrypter;
|
|
Int32ValueInliner int32ValueInliner;
|
|
Int64ValueInliner int64ValueInliner;
|
|
SingleValueInliner singleValueInliner;
|
|
DoubleValueInliner doubleValueInliner;
|
|
ProxyCallFixer proxyCallFixer;
|
|
MethodsDecrypter methodsDecrypter;
|
|
|
|
internal class Options : OptionsBase {
|
|
public bool InlineMethods { get; set; }
|
|
public bool RemoveInlinedMethods { get; set; }
|
|
public bool DecryptMethods { get; set; }
|
|
public bool DecryptResources { get; set; }
|
|
public bool DecryptConstants { get; set; }
|
|
public bool DumpEmbeddedAssemblies { get; set; }
|
|
}
|
|
|
|
public override string Type {
|
|
get { return DeobfuscatorInfo.THE_TYPE; }
|
|
}
|
|
|
|
public override string TypeLong {
|
|
get { return DeobfuscatorInfo.THE_NAME; }
|
|
}
|
|
|
|
public override string Name {
|
|
get { return obfuscatorName; }
|
|
}
|
|
|
|
protected override bool CanInlineMethods {
|
|
get { return startedDeobfuscating ? options.InlineMethods : true; }
|
|
}
|
|
|
|
public override IEnumerable<IBlocksDeobfuscator> BlocksDeobfuscators {
|
|
get {
|
|
var list = new List<IBlocksDeobfuscator>();
|
|
if (CanInlineMethods)
|
|
list.Add(new BabelMethodCallInliner());
|
|
return list;
|
|
}
|
|
}
|
|
|
|
public Deobfuscator(Options options)
|
|
: base(options) {
|
|
this.options = options;
|
|
}
|
|
|
|
public override void init(ModuleDefinition module) {
|
|
base.init(module);
|
|
}
|
|
|
|
protected override int detectInternal() {
|
|
int val = 0;
|
|
|
|
int sum = toInt32(resourceResolver.Detected) +
|
|
toInt32(assemblyResolver.Detected) +
|
|
toInt32(stringDecrypter.Detected) +
|
|
toInt32(constantsDecrypter.Detected) +
|
|
toInt32(proxyCallFixer.Detected) +
|
|
toInt32(methodsDecrypter.Detected) +
|
|
toInt32(hasMetadataStream("Babel"));
|
|
if (sum > 0)
|
|
val += 100 + 10 * (sum - 1);
|
|
if (foundBabelAttribute)
|
|
val += 10;
|
|
|
|
return val;
|
|
}
|
|
|
|
protected override void scanForObfuscator() {
|
|
findBabelAttribute();
|
|
var resourceDecrypterCreator = new ResourceDecrypterCreator(module, DeobfuscatedFile);
|
|
resourceResolver = new ResourceResolver(module, resourceDecrypterCreator.create(), DeobfuscatedFile);
|
|
resourceResolver.find();
|
|
assemblyResolver = new AssemblyResolver(module, resourceDecrypterCreator.create());
|
|
assemblyResolver.find();
|
|
stringDecrypter = new StringDecrypter(module, resourceDecrypterCreator.create());
|
|
stringDecrypter.find(DeobfuscatedFile);
|
|
constantsDecrypter = new ConstantsDecrypter(module, resourceDecrypterCreator.create(), initializedDataCreator);
|
|
constantsDecrypter.find();
|
|
proxyCallFixer = new ProxyCallFixer(module);
|
|
proxyCallFixer.findDelegateCreator();
|
|
methodsDecrypter = new MethodsDecrypter(module, resourceDecrypterCreator.create(), DeobfuscatedFile.DeobfuscatorContext);
|
|
methodsDecrypter.find();
|
|
}
|
|
|
|
void findBabelAttribute() {
|
|
foreach (var type in module.Types) {
|
|
if (type.FullName == "BabelAttribute" || type.FullName == "BabelObfuscatorAttribute") {
|
|
foundBabelAttribute = true;
|
|
checkVersion(type);
|
|
addAttributeToBeRemoved(type, "Obfuscator attribute");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void checkVersion(TypeDefinition attr) {
|
|
var versionField = DotNetUtils.getFieldByName(attr, "Version");
|
|
if (versionField != null && versionField.IsLiteral && versionField.Constant != null && versionField.Constant is string) {
|
|
var val = Regex.Match((string)versionField.Constant, @"^(\d+\.\d+\.\d+\.\d+)$");
|
|
if (val.Groups.Count < 2)
|
|
return;
|
|
obfuscatorName = string.Format("{0} {1}", DeobfuscatorInfo.THE_NAME, val.Groups[1].ToString());
|
|
return;
|
|
}
|
|
}
|
|
|
|
public override void deobfuscateBegin() {
|
|
base.deobfuscateBegin();
|
|
|
|
if (options.DecryptResources) {
|
|
addCctorInitCallToBeRemoved(resourceResolver.InitMethod);
|
|
addTypeToBeRemoved(resourceResolver.Type, "Resource resolver type");
|
|
}
|
|
|
|
decryptResources();
|
|
stringDecrypter.initialize();
|
|
|
|
if (Operations.DecryptStrings != OpDecryptString.None) {
|
|
if (stringDecrypter.Resource != null)
|
|
Log.v("Adding string decrypter. Resource: {0}", Utils.toCsharpString(stringDecrypter.Resource.Name));
|
|
staticStringInliner.add(stringDecrypter.DecryptMethod, (method, gim, args) => {
|
|
return stringDecrypter.decrypt(args);
|
|
});
|
|
DeobfuscatedFile.stringDecryptersAdded();
|
|
}
|
|
|
|
if (options.DumpEmbeddedAssemblies) {
|
|
assemblyResolver.initialize(DeobfuscatedFile, this);
|
|
|
|
// Need to dump the assemblies before decrypting methods in case there's a reference
|
|
// in the encrypted code to one of these assemblies.
|
|
dumpEmbeddedAssemblies();
|
|
}
|
|
|
|
if (options.DecryptMethods) {
|
|
methodsDecrypter.initialize(DeobfuscatedFile, this);
|
|
methodsDecrypter.decrypt();
|
|
}
|
|
|
|
if (options.DecryptConstants) {
|
|
constantsDecrypter.initialize(DeobfuscatedFile, this);
|
|
|
|
addTypeToBeRemoved(constantsDecrypter.Type, "Constants decrypter type");
|
|
addResourceToBeRemoved(constantsDecrypter.Resource, "Encrypted constants");
|
|
int32ValueInliner = new Int32ValueInliner();
|
|
int32ValueInliner.add(constantsDecrypter.Int32Decrypter, (method, gim, args) => constantsDecrypter.decryptInt32((int)args[0]));
|
|
int64ValueInliner = new Int64ValueInliner();
|
|
int64ValueInliner.add(constantsDecrypter.Int64Decrypter, (method, gim, args) => constantsDecrypter.decryptInt64((int)args[0]));
|
|
singleValueInliner = new SingleValueInliner();
|
|
singleValueInliner.add(constantsDecrypter.SingleDecrypter, (method, gim, args) => constantsDecrypter.decryptSingle((int)args[0]));
|
|
doubleValueInliner = new DoubleValueInliner();
|
|
doubleValueInliner.add(constantsDecrypter.DoubleDecrypter, (method, gim, args) => constantsDecrypter.decryptDouble((int)args[0]));
|
|
}
|
|
|
|
proxyCallFixer.find();
|
|
startedDeobfuscating = true;
|
|
}
|
|
|
|
void dumpEmbeddedAssemblies() {
|
|
if (!options.DumpEmbeddedAssemblies)
|
|
return;
|
|
foreach (var info in assemblyResolver.EmbeddedAssemblyInfos)
|
|
DeobfuscatedFile.createAssemblyFile(info.data, Utils.getAssemblySimpleName(info.fullname), info.extension);
|
|
addTypeToBeRemoved(assemblyResolver.Type, "Assembly resolver type");
|
|
addCctorInitCallToBeRemoved(assemblyResolver.InitMethod);
|
|
addResourceToBeRemoved(assemblyResolver.EncryptedResource, "Embedded encrypted assemblies");
|
|
}
|
|
|
|
void decryptResources() {
|
|
if (!options.DecryptResources)
|
|
return;
|
|
var rsrc = resourceResolver.mergeResources();
|
|
if (rsrc == null)
|
|
return;
|
|
addResourceToBeRemoved(rsrc, "Encrypted resources");
|
|
}
|
|
|
|
public override void deobfuscateMethodEnd(Blocks blocks) {
|
|
proxyCallFixer.deobfuscate(blocks);
|
|
if (options.DecryptConstants) {
|
|
int32ValueInliner.decrypt(blocks);
|
|
int64ValueInliner.decrypt(blocks);
|
|
singleValueInliner.decrypt(blocks);
|
|
doubleValueInliner.decrypt(blocks);
|
|
constantsDecrypter.deobfuscate(blocks);
|
|
}
|
|
base.deobfuscateMethodEnd(blocks);
|
|
}
|
|
|
|
public override void deobfuscateEnd() {
|
|
removeInlinedMethods();
|
|
if (CanRemoveStringDecrypterType) {
|
|
addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
|
|
addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
|
|
}
|
|
|
|
removeProxyDelegates(proxyCallFixer);
|
|
base.deobfuscateEnd();
|
|
}
|
|
|
|
void removeInlinedMethods() {
|
|
if (!options.InlineMethods || !options.RemoveInlinedMethods)
|
|
return;
|
|
removeInlinedMethods(BabelMethodCallInliner.find(module, staticStringInliner.Methods));
|
|
}
|
|
|
|
public override IEnumerable<int> getStringDecrypterMethods() {
|
|
var list = new List<int>();
|
|
if (stringDecrypter.DecryptMethod != null)
|
|
list.Add(stringDecrypter.DecryptMethod.MetadataToken.ToInt32());
|
|
return list;
|
|
}
|
|
}
|
|
}
|